Objective. To study the frequency of mental disorders with concomitant insomnia in obese patients. Material and methods. Authors studied 123 patients (51 men and 72 women, mean age 40.0±11.5; body mass 117.6±30.9 kg; waist circumference 118.2±19.8 cm; BMI 39.8±8.7 kg/m2) with obesity. Results. The questionnaire survey revealed subjective disorders of the quality of sleep in 76%, complaints about snoring in 63%, hypersomnia during the day in 55% higher risk of sleep apnea in 50%, insomnia in 45% of patients. According to the results of psychological testing, the obese patients with insomnia had higher levels of health anxiety. Conclusion. Insomnia can be considered as a marker of overt psychopathological disturbances in patients with obesity.